On this day in 1977, a small embankment dam located above Toccoa Falls Bible College in Georgia failed, releasing a wall of water that killed 39 people. This dam failure along with several others in the 1970s brought drastic changes in dam safety, such as the establishment of the National Dam Safety Program and many relevant state programs around the country. There are more than 90,000 dams in the US, out of which more than 15,000 are classified as high-hazard-potential structures, meaning that their failure would likely cause loss of life.

It was the fiercest hurricane to hit the U.S. in more than a decade spun, making landfall in Texas. Harvey developed from a tropical wave to a Category 4 storm, coming ashore on August 25th and causing historic flooding. At peak intensity, the hurricane’s wind speed reached 130 mph. Check below structures that didn’t cope with these powerful winds and the major flooding in the area.

The Millennium Tower is a high-rise luxurious building and a landmark of San Francisco. The impressive structure stands out and is the tallest residential building in San Francisco, but recently, structural problems have been reported. The tower has been sinking into the ground and there is concern for even more serious damage.